You completed your B.Sc. with a pass degree, and now you want to pursue a Master's degree in Mathematics. Here's a general guide for you:

1. Entry Requirements for M.Sc. Mathematics :-Many universities may require a background in mathematics, but since you took Physics honors, there may be some overlap in subjects such as mathematical physics, calculus, and linear algebra.
2. Mathematical Background:-If your B.Sc. didn’t cover the required mathematics topics, you can take bridge courses in subjects like calculus, algebra, and real analysis. Many universities and online platforms like Coursera, edX, or Khan Academy offer these courses.
3. Postgraduate Diploma or Certificate :-Some universities offer postgraduate diplomas or certificates in Mathematics or related fields.
4. Entrance Exams:-Some universities may require you to pass an entrance exam for admission into their M.Sc. Mathematics program.

If you want me to suggest some universities kindly let me know in the comment section.